How to fix mod_rewrite problem with static to dynamic content - apache

Question

I would appreciate if someone can help with this mod rewrite issue. For years I had this in my htaccess, apache include files and it worked just fine.
RewriteRule ^/article/([0-9]*).html$ /article/article.php?id=$1 [NC,L]
But recently it stopped working. Browser shows "No input file specified." and access log shows 404 response code the requests that had to be fulfilled by the condition above.
RewriteEngine is on. This is what my htaccess mod_rewrite rules at the moment
<IfModule mod_rewrite.c>
Options -MultiViews
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule \.(js|css|jpeg|jpg|gif|png|ico|map)(\?|$) /404error.php [L,NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
RewriteRule ^/article/([0-9]*).html$ /article/article.php?id=$1 [NC,L]
RewriteRule ^/relationships/([0-9]*).html$ /article/article.php?id=$1 [NC,L]
</IfModule>

Answer 1

With your shown samples/attempts, could you please try following htaccess Rules. Please make sure to place your htaccess rules file in root and clear your browser cache before testing your URLs.
<IfModule mod_rewrite.c>
Options -MultiViews -Indexes
RewriteEngine On
RewriteBase /
##Rules for non-existing pages.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ index.php [L]
##Rules for articile and relationship uris here.
RewriteRule ^(?:article|relationships)/([0-9]*)\.html/?$ article/article.php?id=$1 [NC,L]
##Rules for 404 handling.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule \.(js|css|jpeg|jpg|gif|png|ico|map)(\?|$) 404error.php [L,NC]
</IfModule>